PowerPoint PresentationCopyright - HST
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Copyright – S. Miyazaki, Suburu
NGC 891 – Copyright WIYN
M10 – copyright Credner and Kohle
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Milky Way HI emission – Copyright J. Dickey
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Rotation Curves
If HI gas is rotating or moving, the 21cm radiation will be Doppler Shifted.
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Get estimates of mass.
Result: more dark matter.
Get mass estimates.
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Nearly all are redshifted.
Use Cepheids to measure distances to nearby galaxies.
Result: The faster it’s moving, the farther away it is.
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